논단 2-전자기기의 뇌써-지 대책

이복희,Lee, Bok-Hui 한국전기산업진흥회 1996 電氣産業 Vol.7 No.1

Ranking Forward-Looking Centers and Discourse structure

이복희 한국영미어문학회 2002 영미어문학 Vol.- No.66

On the Integration of the Centering Algorithm with Models of Global Discourse Structure

이복희 한국영미어문학회 2004 영미어문학 Vol.- No.73

This paper discusses the searching mechanism of the antecedent of (overt and null) pronouns in English and Korean. Since centering is underspecified with respect to its interaction to global discourse structure, it is difficult to test centering on extended discourses. Extended discourses are likely to consist of multiple segments, but any claim of the theory cannot be tested on two utterances that span a discourse segment boundary. In this paper, I argue that the restriction of centering to operate within a discourse segment poses many problems for centering theory. They can be eliminated by abandoning this restriction, and by integrating centering with Grosz and Sidner's (1986) stack model and the cache model of attentional state proposed in Walker (1996, 1998).

전력설비용 접지시스템에 공결점에 따른 과도응답특성

이복희,이승칠,엄주홍,심판섭 한국조명전기설비학회 1999 조명·전기설비학회논문지 Vol.13 No.3

본 논문은 임펄스전류에 대한 전력설비용 접지시스템의 과도응답특성에 대하여 기술하엿으며, 피뢰기 접지도선을 통하여 임펄스전류가 유입될 때, 공결점과 다른 접지도선에 유도되는 전위상승을 측정·분석하였다. 낙뢰서지에 의한 피뢰기의 동작을 모의하기 위하여 뇌임펄스전류를 인가하였으며, 본 실험에서 얻은 임펄스 응답특성의 실험결과는 다음과 같다. 접지전극에 유도되는 전위상승은 접지도선에 유도된 것과는 상당히 달았으며, 다른 독립접지전극에도 높은 전위유도가 발생하였다. 또한 임펄스전류에 의한 접지전극과 접지도선의 전위상승은 공결점의 위치에 따라 현저하게 변하였다. 근방공결한 경우 임펄스전류에 의한 공결점의 전위상승은 원방공결한 경우보다 낮게 나타났다. 피뢰기 접지도선의 전위상승은 근방공결한 경우가 원방공결항 것보다 높게 나타났다. 따라서 전위상승의 측면을 고려하면 근방공결하는 경우가 원방공결하는 것보다 효과적이고, 전력기기의 절연보호 측면에서는 원방공결하는 것이 보다 효과적임을 알았다. Ths paper describes the transient response characteristics of the grounding systems for electric power facilities against impluse currents. In this work, when the impulse current was injected through the grounding conductor for arrester, the investigations treasuring and analyzing potential rises induced at the cormron cormection trint and other grounding conductors were conducted. The lightning impulse current was awliErl so as to simulate the on-set of arrester due to lightning surges. Measured results of impulse response characteristics from the present experinrrits are as follows;

운방전에 의해서 방사된 자장 파형의 파라미터

이복희,안창환,장석훈 한국전자파학회 1999 한국전자파학회논문지 Vol.10 No.6

본 논문에서는 운방전에 의해서 방사되는 자장 파형을 측정할 수 있는 루프형 자장 센서를 이용한 계측장 치를 제작하고, 뇌방전과 관측점 사이의 거리측정계를 제안하였다. 정극성과 부극성의 자장 파형에 대한 중첩 펄스의 시간 간격, 영점 교차시간과 백분율 반전답의 깊이 등의 파라미터를 뇌방전 지점과 관측 지점 사이의 거리에 따라 통계적으로 분석하였으며, 그 결과를 요약하면 다음과 같다 운방전에 의해서 발생한 자장 파형 의 파두 부분에는 수 개의 중첩 펄스가 관측되었으며, 이들 펄스 사이의 평균 시간 간격은 약 $4\mu\textrm{s}$이었다. 또 한, 양극성 특성이 명확하게 나타났으며, 백분율 반전답의 깊이는 약 57 -65 %이었다. 뇌방전 지점에서 관측 지점 사이의 거리가 증가할수록 영점 교차시간은 짧아졌다. In this paper, the recording device for measuring the magnetic field waveforms associated with the cloud lightning discharges was made by the loop-type magnetic field sensor, and the measuring system of a distance between lightning stroke point and observatory site was proposed. The parameters including the time interval of superimposed pulses, zero-to-zero crossing time and the percentage depth of the dip for the positive and the negative magnetic field waveforms were statistically analyzed as a function of the distance between the lightning discharge point and the observatory site. The results could be summarized as follows; Several superimposed pulses were observed at the initial front part of the magnetic field waveform produced by cloud lightning discharges, and the mean time interval between superimposed pulses was about $4\mu\textrm{s}$. Also, the bipolar characteristic appeared significantly and the percentage depth of the dip was about 57~65%. It was known that the zero-to-zero crossing time of the electromagnetic fields is gradually decreased as a distance between lightning discharge point and observatory site is increased.

비선형 소자 및 서지억제회로의 Pspice 시뮬레이션

이복희,공영은,최원규,전덕규,Lee, Bok-Hui,Gong, Yeong-Eun,Choe, Won-Gyu,Jeon, Deok-Gyu 대한전기학회 2000 전기학회논문지C Vol.54 No.12

This paper presents Pspice modeling methods for spark gaps and ZnO varistors and describes the application for the two-stage surge suppression circuit which was composed of the nonlinear components. The simulation modelings of nonlinear components were conducted on the basis of the voltage and current curves measured by the impulse current with the time-to-crest of $1~50 \mus$ and the impulse voltage with the rate of the time-to-crest of 10, 100 and 1000 V/\mus$</TEx>. The firing voltages of the spark gap increased with increasing the rate of the time-to-crest of impulse voltage and the measured data were in good agreement with the simulated data. The I-V curves of the ZnO varistor were measured by applying the impulse currents of which time-to-crests range from 1 to $50 \mus$ and peak amplitudes from 10 A to 2 kA. The simulation modeling was based on the I-V curves replotted by taking away the inductive effects of the test circuit and leads. The meximum difference between the measured and calculated data was of the order of 3%. Also the two-stage surge suppression circuit made of the spark gap and the ZnO varistor was investigated with the impulse voltage of $10/1000\mus$$mutextrm{s}$ wave shape. The overall agreement between the theoretical and experimental results seems to be acceptable. As a consequence, it was known that the proposed simulation techniques could effectively be used to design the surge suppression circuits combined with nonlinear components.

토론 : 개인별 맞춤형 위탁프로그램(Program) 운영방안 모색 -위탁교육기관 운영 중심으로-

이복희 한국청소년학회 2009 21세기 청소년 포럼 Vol.49 No.-

인체유용성이 강화된 축산물의 생산 및 이용과 축산물이 심혈관계 질환에 미치는 영향에 대한 고찰

이복희 中央大學校 家庭文化硏究所 1995 가정문화논총 Vol.9 No.-

Livestock products like meat, milk, and egg have been principal food sources for human beings since the historic periods of time. Nowadays consumption of these food items have been avoided due to its highly significant negative effects on chronic adult diseases causing the major deaths of people. However, that kind of relationship between livestock products and diseases is not always true because the influences of meat and by-products on diseases depend on the composition and the type of fatty acids. Therefore, the necessity of development of new types of foods equipped with biofunctional effectiveness which can improve health or body function, has been risen more than ever. Meat with high protein and low fat can be produced by incorporating chemical compouns like clenbuterol, cimaterol etc. during breeding. Also, transgenic technology can be applied to reduce fat contents. These two methods brought benefits like higher growth rate, lower fat content and improved feed efficiency ratios. Biologically active peptides increase the absorption of proteins and accelerate the synthesis of milk proteins. Egg products have faced reduced sales annually because of its high cholesterol contents. Recently, brand eggs fortified with special nutrients or chemical components having functional properties in the human body system are very popular. Research interests have been focused on eggs with low cholesterol and high omega-3 fatty acids. Low cholesterol eggs and high omega-3 eggs can be produced in several different ways, but popular way of production is feeding the diets with different oil sources containing high omega-3 and 6 fatty acids such as fish oil, perilla oil, linseed oil and lecithin etc. But proper composition of feed formula should be found and economically beneficial. Nevertheless the improved meat and meat products were developed and produced, still the livestock products are the major culprits of chronic adult diseases. But researches refelect that meat fat is not the cause of the diseases but the composition of meat fats. Stearic acids, major fatty acids of beef and several meat, are no longer the hypercholesterolemic and at least neutral in terms of body cholesterol concentrations. Also, oleic aicds high in meat is rather hypocholesterolemic. In fact, short chain fatty acids like lauric and myristic acids are more hypercholesterolemic. In addition, high intakes of omega-3 and -6 fatty acids have appeared to promote tumor production and platlet formation. Therefore, the ideas and cognitions about meat and meat products should have been changed at different angle and meat and meat products should not been avoided simply because of highly saturated fat. Also the right way of eating pattern should be established without omitting meat and meat products and health should be maintained and improved through balanced dietary life.

SF(sub)6-$N_2$혼합가스중에 뇌임펄스전압에 의해 형성된 불평등전장에서의 전구방전현상

이복희,이경옥,백승권 대한전기학회 2001 전기학회논문지C Vol.50 No.6

Predischarges in nonuniform electric field stressed by lightning impulse voltagesin SF(sub)6-$N_2$mixtures are initiated by streamer coronas. Due to field ehnancement at a protrusion point of electrodes new ionization processes occur and a precursor, which leads to a first leader, is created. The leader proceeds step by step to the opposite electrode and the final jump bridges the test gap. It was found that the predischarge is propagated with a leader mechanism of stepwise expansion from the predischarge current waveforms measured by a shunt. The predischarge current is closely related to the amplitude and polarity of applied voltages, the gas pressure and the gap geometry. The time intervals between step leaders for the positive and negative polarities were inversely proportional to V.P$^2$. When the gas pressure increases in the positive polarity, statistical time lag to statistical time lag to streamer corona inception increase slightly, but the formative time lag to flashover is significantly decreased.

지역필터를 이용한 수변전실 접지저항의 새로운 측정방법

이복희,엄주홍,이승칠,김성원,안창환,Lee, Bok-Hui,Eom, Ju-Hong,Lee, Seung-Chil,Kim, Seong-Won,An, Chang-Hwan 대한전기학회 2001 전기학회논문지C Vol.51 No.3

This paper describes an advanced measuring method and precise evaluation of the ground resistance for the grounding system of energized substations and power equipments. A grounding system of substations consists of all interconnected grounding connections of grounded conductors, neutral ground wires, underground conductors of distribution lines, cable shields, grounding terminals of equipments, and etc. It is very difficult to measure the accurate ground resistance of the grounding terminals of equipments, and etc. It is very difficult to measure the accurate ground resistance of the grounding system of high voltage energized substations because of harmonic components caused by switched power supplies or overloads. The conventional fall-of-potential method may be subject to big error if stray ground currents and potentials are present. In this work, to improve the precision in measurements of the ground resistance by eliminating the effects of harmonic components and stray currents and potentials, the investigations of the ground resistance measurement by using a low pass filter in a model energized grounding system were conducted. The accuracy of ground resistance mesurements was evaluated as a function of the ratio of the test signal to noise (S/N). The errors due to the proposed ground resistance measurement method were decreased with increasing S/N and were less than 5[%] as S/N is 10. The proposed ground resistance measurement method appears to be considerably more accurate than the conventional fall-of -potential method. It is allows cancellation of the parasitic resistance of energized grounding systems, to employ the measurement method that allows cancellation of the parasitic effects due to other circulating ground currents and ground potential rises in practical situations.